Alc/backends/wave.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <memory.h>
  26 #include "alMain.h"
  27 #include "AL/al.h"
  28 #include "AL/alc.h"
  29
  30
  31 typedef struct {
  32     FILE *f;
  33     long DataStart;
  34
  35     ALvoid *buffer;
  36     ALuint size;
  37
  38     volatile int killNow;
  39     ALvoid *thread;
  40 } wave_data;
  41
  42
  43 static const ALCchar waveDevice[] = "Wave File Writer";
  44
  45 static const ALubyte SUBTYPE_PCM[] = {
  46     0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
  47     0x00, 0x38, 0x9b, 0x71
  48 };
  49 static const ALubyte SUBTYPE_FLOAT[] = {
  50     0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
  51     0x00, 0x38, 0x9b, 0x71
  52 };
  53
  54 static const ALuint channel_masks[] = {
  55     0, /* invalid */
  56     0x4, /* Mono */
  57     0x1 | 0x2, /* Stereo */
  58     0, /* 3 channel */
  59     0x1 | 0x2 | 0x10 | 0x20, /* Quad */
  60     0, /* 5 channel */
  61     0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20, /* 5.1 */
  62     0x1 | 0x2 | 0x4 | 0x8 | 0x100 | 0x200 | 0x400, /* 6.1 */
  63     0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20 | 0x200 | 0x400, /* 7.1 */
  64 };
  65
  66
  67 static void fwrite16le(ALushort val, FILE *f)
  68 {
  69     fputc(val&0xff, f);
  70     fputc((val>>8)&0xff, f);
  71 }
  72
  73 static void fwrite32le(ALuint val, FILE *f)
  74 {
  75     fputc(val&0xff, f);
  76     fputc((val>>8)&0xff, f);
  77     fputc((val>>16)&0xff, f);
  78     fputc((val>>24)&0xff, f);
  79 }
  80
  81
  82 static ALuint WaveProc(ALvoid *ptr)
  83 {
  84     ALCdevice *pDevice = (ALCdevice*)ptr;
  85     wave_data *data = (wave_data*)pDevice->ExtraData;
  86     ALuint frameSize;
  87     ALuint now, start;
  88     ALuint64 avail, done;
  89     size_t fs;
  90     const ALuint restTime = (ALuint64)pDevice->UpdateSize * 1000 /
  91                             pDevice->Frequency / 2;
  92
  93     frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
  94
  95     done = 0;
  96     start = timeGetTime();
  97     while(!data->killNow && pDevice->Connected)
  98     {
  99         now = timeGetTime();
 100
 101         avail = (ALuint64)(now-start) * pDevice->Frequency / 1000;
 102         if(avail < done)
 103         {
 104             /* Timer wrapped. Add the remainder of the cycle to the available
 105              * count and reset the number of samples done */
 106             avail += (ALuint64)0xFFFFFFFFu*pDevice->Frequency/1000 - done;
 107             done = 0;
 108         }
 109         if(avail-done < pDevice->UpdateSize)
 110         {
 111             Sleep(restTime);
 112             continue;
 113         }
 114
 115         while(avail-done >= pDevice->UpdateSize)
 116         {
 117             aluMixData(pDevice, data->buffer, pDevice->UpdateSize);
 118             done += pDevice->UpdateSize;
 119
 120             if(!IS_LITTLE_ENDIAN)
 121             {
 122                 ALuint bytesize = BytesFromDevFmt(pDevice->FmtType);
 123                 ALubyte *bytes = data->buffer;
 124                 ALuint i;
 125
 126                 if(bytesize == 1)
 127                 {
 128                     for(i = 0;i < data->size;i++)
 129                         fputc(bytes[i], data->f);
 130                 }
 131                 else if(bytesize == 2)
 132                 {
 133                     for(i = 0;i < data->size;i++)
 134                         fputc(bytes[i^1], data->f);
 135                 }
 136                 else if(bytesize == 4)
 137                 {
 138                     for(i = 0;i < data->size;i++)
 139                         fputc(bytes[i^3], data->f);
 140                 }
 141             }
 142             else
 143                 fs = fwrite(data->buffer, frameSize, pDevice->UpdateSize,
 144                             data->f);
 145             if(ferror(data->f))
 146             {
 147                 ERR("Error writing to file\n");
 148                 aluHandleDisconnect(pDevice);
 149                 break;
 150             }
 151         }
 152     }
 153
 154     return 0;
 155 }
 156
 157 static ALCenum wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
 158 {
 159     wave_data *data;
 160     const char *fname;
 161
 162     fname = GetConfigValue("wave", "file", "");
 163     if(!fname[0])
 164         return ALC_INVALID_VALUE;
 165
 166     if(!deviceName)
 167         deviceName = waveDevice;
 168     else if(strcmp(deviceName, waveDevice) != 0)
 169         return ALC_INVALID_VALUE;
 170
 171     data = (wave_data*)calloc(1, sizeof(wave_data));
 172
 173     data->f = fopen(fname, "wb");
 174     if(!data->f)
 175     {
 176         free(data);
 177         ERR("Could not open file '%s': %s\n", fname, strerror(errno));
 178         return ALC_INVALID_VALUE;
 179     }
 180
 181     device->szDeviceName = strdup(deviceName);
 182     device->ExtraData = data;
 183     return ALC_NO_ERROR;
 184 }
 185
 186 static void wave_close_playback(ALCdevice *device)
 187 {
 188     wave_data *data = (wave_data*)device->ExtraData;
 189
 190     fclose(data->f);
 191     free(data);
 192     device->ExtraData = NULL;
 193 }
 194
 195 static ALCboolean wave_reset_playback(ALCdevice *device)
 196 {
 197     wave_data *data = (wave_data*)device->ExtraData;
 198     ALuint channels=0, bits=0;
 199     size_t val;
 200
 201     fseek(data->f, 0, SEEK_SET);
 202     clearerr(data->f);
 203
 204     switch(device->FmtType)
 205     {
 206         case DevFmtByte:
 207             device->FmtType = DevFmtUByte;
 208             break;
 209         case DevFmtUShort:
 210             device->FmtType = DevFmtShort;
 211             break;
 212         case DevFmtUInt:
 213             device->FmtType = DevFmtInt;
 214             break;
 215         case DevFmtUByte:
 216         case DevFmtShort:
 217         case DevFmtInt:
 218         case DevFmtFloat:
 219             break;
 220     }
 221     bits = BytesFromDevFmt(device->FmtType) * 8;
 222     channels = ChannelsFromDevFmt(device->FmtChans);
 223
 224     fprintf(data->f, "RIFF");
 225     fwrite32le(0xFFFFFFFF, data->f); // 'RIFF' header len; filled in at close
 226
 227     fprintf(data->f, "WAVE");
 228
 229     fprintf(data->f, "fmt ");
 230     fwrite32le(40, data->f); // 'fmt ' header len; 40 bytes for EXTENSIBLE
 231
 232     // 16-bit val, format type id (extensible: 0xFFFE)
 233     fwrite16le(0xFFFE, data->f);
 234     // 16-bit val, channel count
 235     fwrite16le(channels, data->f);
 236     // 32-bit val, frequency
 237     fwrite32le(device->Frequency, data->f);
 238     // 32-bit val, bytes per second
 239     fwrite32le(device->Frequency * channels * bits / 8, data->f);
 240     // 16-bit val, frame size
 241     fwrite16le(channels * bits / 8, data->f);
 242     // 16-bit val, bits per sample
 243     fwrite16le(bits, data->f);
 244     // 16-bit val, extra byte count
 245     fwrite16le(22, data->f);
 246     // 16-bit val, valid bits per sample
 247     fwrite16le(bits, data->f);
 248     // 32-bit val, channel mask
 249     fwrite32le(channel_masks[channels], data->f);
 250     // 16 byte GUID, sub-type format
 251     val = fwrite(((bits==32) ? SUBTYPE_FLOAT : SUBTYPE_PCM), 1, 16, data->f);
 252
 253     fprintf(data->f, "data");
 254     fwrite32le(0xFFFFFFFF, data->f); // 'data' header len; filled in at close
 255
 256     if(ferror(data->f))
 257     {
 258         ERR("Error writing header: %s\n", strerror(errno));
 259         return ALC_FALSE;
 260     }
 261
 262     data->DataStart = ftell(data->f);
 263
 264     data->size = device->UpdateSize * channels * bits / 8;
 265     data->buffer = malloc(data->size);
 266     if(!data->buffer)
 267     {
 268         ERR("Buffer malloc failed\n");
 269         return ALC_FALSE;
 270     }
 271
 272     SetDefaultWFXChannelOrder(device);
 273
 274     data->thread = StartThread(WaveProc, device);
 275     if(data->thread == NULL)
 276     {
 277         free(data->buffer);
 278         data->buffer = NULL;
 279         return ALC_FALSE;
 280     }
 281
 282     return ALC_TRUE;
 283 }
 284
 285 static void wave_stop_playback(ALCdevice *device)
 286 {
 287     wave_data *data = (wave_data*)device->ExtraData;
 288     ALuint dataLen;
 289     long size;
 290
 291     if(!data->thread)
 292         return;
 293
 294     data->killNow = 1;
 295     StopThread(data->thread);
 296     data->thread = NULL;
 297
 298     data->killNow = 0;
 299
 300     free(data->buffer);
 301     data->buffer = NULL;
 302
 303     size = ftell(data->f);
 304     if(size > 0)
 305     {
 306         dataLen = size - data->DataStart;
 307         if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
 308             fwrite32le(dataLen, data->f); // 'data' header len
 309         if(fseek(data->f, 4, SEEK_SET) == 0)
 310             fwrite32le(size-8, data->f); // 'WAVE' header len
 311     }
 312 }
 313
 314
 315 static const BackendFuncs wave_funcs = {
 316     wave_open_playback,
 317     wave_close_playback,
 318     wave_reset_playback,
 319     wave_stop_playback,
 320     NULL,
 321     NULL,
 322     NULL,
 323     NULL,
 324     NULL,
 325     NULL
 326 };
 327
 328 ALCboolean alc_wave_init(BackendFuncs *func_list)
 329 {
 330     *func_list = wave_funcs;
 331     return ALC_TRUE;
 332 }
 333
 334 void alc_wave_deinit(void)
 335 {
 336 }
 337
 338 void alc_wave_probe(enum DevProbe type)
 339 {
 340     if(!ConfigValueExists("wave", "file"))
 341         return;
 342
 343     switch(type)
 344     {
 345         case ALL_DEVICE_PROBE:
 346             AppendAllDeviceList(waveDevice);
 347             break;
 348         case CAPTURE_DEVICE_PROBE:
 349             break;
 350     }
 351 }